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Questions and Answers
Which keyword is used to pause execution of the executeAsyncTask function until promise settles?
Which keyword is used to pause execution of the executeAsyncTask function until promise settles?
- delay
- pause
- stop
- await (correct)
If the promise is rejected, what happens?
If the promise is rejected, what happens?
- The promise is paused
- The function returns null
- The program continues normally
- An error is thrown (correct)
Which of the following is an example of an HTTP request method?
Which of the following is an example of an HTTP request method?
- GET
- PUT
- DELETE
- All of the above (correct)
What does the HTTP status code 404 indicate?
What does the HTTP status code 404 indicate?
What does the term 'CORS' stand for?
What does the term 'CORS' stand for?
If the promise is fulfilled, where does the fulfilled value assign to?
If the promise is fulfilled, where does the fulfilled value assign to?
Which method is used to extract the JSON data from the response object?
Which method is used to extract the JSON data from the response object?
Which HTTP method is used to update a specific resource with new data?
Which HTTP method is used to update a specific resource with new data?
Which HTTP status code is returned when a webpage or resource does not exist?
Which HTTP status code is returned when a webpage or resource does not exist?
What does the 'Content-Type' header indicate in an HTTP request?
What does the 'Content-Type' header indicate in an HTTP request?
What are the two fundamental ways of handling asynchronous operations in JavaScript?
What are the two fundamental ways of handling asynchronous operations in JavaScript?
Which method is used to extract the JSON data from the response object?
Which method is used to extract the JSON data from the response object?
Which of the following is an example of an HTTP request method?
Which of the following is an example of an HTTP request method?
According to the text, what does HTTP stand for?
According to the text, what does HTTP stand for?
What does HTTP define?
What does HTTP define?
What property is used to specify the POST request in the Fetch API?
What property is used to specify the POST request in the Fetch API?
Which method is used to extract the JSON data from the response object in the Fetch API?
Which method is used to extract the JSON data from the response object in the Fetch API?
Which of the following is an example of an HTTP request method?
Which of the following is an example of an HTTP request method?
What are the two dialogues between web servers and browsers?
What are the two dialogues between web servers and browsers?
What is the response for successfully creating a new database entry?
What is the response for successfully creating a new database entry?
What is the HTTP status code for successfully fetching data?
What is the HTTP status code for successfully fetching data?
What is the HTTP status code for trying to fetch a webpage or resource that doesn't exist?
What is the HTTP status code for trying to fetch a webpage or resource that doesn't exist?
What is the HTTP response for successfully deleting an item where no content is returned?
What is the HTTP response for successfully deleting an item where no content is returned?
What is the HTTP response for trying to access protected resources without proper authorization?
What is the HTTP response for trying to access protected resources without proper authorization?
What is the HTTP response for an error in server-side scripting causing a request to fail?
What is the HTTP response for an error in server-side scripting causing a request to fail?
What does the HTTP method 'POST' do?
What does the HTTP method 'POST' do?
Which of the following is an example of using the 'PUT' method?
Which of the following is an example of using the 'PUT' method?
What does the 'DELETE' method do in HTTP?
What does the 'DELETE' method do in HTTP?
What is the primary purpose of the 'headers' in an HTTP request?
What is the primary purpose of the 'headers' in an HTTP request?
How is the 'headers' function in HTTP similar to the 'GET' method, but only requesting for headers?
How is the 'headers' function in HTTP similar to the 'GET' method, but only requesting for headers?
Which of the following is an example of using the 'headers' function or similar functionality in HTTP?
Which of the following is an example of using the 'headers' function or similar functionality in HTTP?
What is the primary purpose of the 'headers' in an HTTP request?
What is the primary purpose of the 'headers' in an HTTP request?
How is the 'headers' function in HTTP similar to the 'GET' method, but only requesting for headers?
How is the 'headers' function in HTTP similar to the 'GET' method, but only requesting for headers?
What is the purpose of Cross-Origin Resource Sharing (CORS) in web development?
What is the purpose of Cross-Origin Resource Sharing (CORS) in web development?
What does CORS prevent in web development?
What does CORS prevent in web development?
How does CORS impact web application development?
How does CORS impact web application development?
What is the purpose of try/catch statements in JavaScript?
What is the purpose of try/catch statements in JavaScript?
Where is the code that may potentially throw an exception placed?
Where is the code that may potentially throw an exception placed?
What does the catch block contain in a try/catch statement?
What does the catch block contain in a try/catch statement?
What is the primary purpose of asynchronous programming in JavaScript?
What is the primary purpose of asynchronous programming in JavaScript?
Which type of actions in JavaScript commonly use asynchronous programming?
Which type of actions in JavaScript commonly use asynchronous programming?
What happens if time-consuming actions in JavaScript are performed without asynchronous programming?
What happens if time-consuming actions in JavaScript are performed without asynchronous programming?
What is a callback function in JavaScript?
What is a callback function in JavaScript?
How is a callback function used in JavaScript?
How is a callback function used in JavaScript?
What is the primary purpose of a callback function in JavaScript?
What is the primary purpose of a callback function in JavaScript?
What represents a value that may not be available yet but will be resolved at some point in the future, or it might get rejected?
What represents a value that may not be available yet but will be resolved at some point in the future, or it might get rejected?
In a Promise, what state indicates that the operation completed successfully?
In a Promise, what state indicates that the operation completed successfully?
What is the primary improvement of Promises over callbacks for handling asynchronous operations?
What is the primary improvement of Promises over callbacks for handling asynchronous operations?
What is the state of a Promise when its result hasn't yet been determined?
What is the state of a Promise when its result hasn't yet been determined?
What state does a Promise enter if the operation fails?
What state does a Promise enter if the operation fails?
What does the Fetch API return?
What does the Fetch API return?
Where is the Fetch API built into in JavaScript?
Where is the Fetch API built into in JavaScript?
What is the purpose of using async/await syntax with the Fetch API?
What is the purpose of using async/await syntax with the Fetch API?
What type of request is being made in the provided code example?
What type of request is being made in the provided code example?
What will be logged to the console in the code example?
What will be logged to the console in the code example?
What does the Fetch API return?
What does the Fetch API return?
What happens if an error occurs during the fetch operation?
What happens if an error occurs during the fetch operation?
What is the purpose of the catch block in a fetch operation?
What is the purpose of the catch block in a fetch operation?
What is the role of the browser when an error occurs during a fetch operation?
What is the role of the browser when an error occurs during a fetch operation?
How can you modify the code example to make a POST request instead of a GET request?
How can you modify the code example to make a POST request instead of a GET request?
What is the correct way to specify a POST request in the Fetch API?
What is the correct way to specify a POST request in the Fetch API?
What should be done to send data with a POST request using the Fetch API?
What should be done to send data with a POST request using the Fetch API?
What does the 'body' property do in the Fetch API POST request?
What does the 'body' property do in the Fetch API POST request?
What is the purpose of the 'headers' property in the Fetch API POST request?
What is the purpose of the 'headers' property in the Fetch API POST request?
What is the role of the 'catch' block in the provided code example?
What is the role of the 'catch' block in the provided code example?
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Study Notes
Async-await and Promises
awaitkeyword is used to pause execution of theexecuteAsyncTaskfunction until promise settles.- If the promise is rejected, an error is thrown.
- If the promise is fulfilled, the fulfilled value is assigned to the variable on the left side of the assignment.
HTTP Requests and Responses
GET,POST,PUT,DELETEare examples of HTTP request methods.- HTTP status code 404 indicates that the webpage or resource does not exist.
- CORS stands for Cross-Origin Resource Sharing.
Content-Typeheader indicates the type of data being sent in an HTTP request.
Fetch API
json()method is used to extract the JSON data from the response object.POSTrequest is used to create a new resource with new data.putmethod is used to update a specific resource with new data.deletemethod is used to delete a specific resource.headersproperty is used to specify headers in an HTTP request.
CORS and Errors
- CORS prevents web pages from making requests to a different origin (domain, protocol, or port) than the one the web page was loaded from.
- CORS prevents cross-site request forgery attacks.
- CORS impacts web application development by requiring additional configuration for cross-origin requests.
Try-Catch Statements
tryblock contains code that may potentially throw an exception.catchblock contains code that will be executed if an exception is thrown.- The primary purpose of
try-catchstatements is to handle exceptions and errors in JavaScript.
Asynchronous Programming
- Asynchronous programming is used to perform time-consuming actions without blocking the execution of other code.
- The primary purpose of asynchronous programming is to improve the responsiveness and performance of web applications.
Callbacks and Promises
- A callback function is a function that is passed as an argument to another function.
- A callback function is used to handle the result of an asynchronous operation.
- Promises represent a value that may not be available yet but will be resolved at some point in the future, or it might get rejected.
- The primary improvement of Promises over callbacks is that Promises provide a more readable and manageable way of handling asynchronous operations.
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